A PCI Serial output card (PC) on a MAC?

As Im working my way to a new G5 in the near future, I came up with another question.
I was already told in here that I could use my PC3200 RAM chips, which is great cause I've got quite a bunch of them.

I also have another valuable device and that is a SERIAL wacom tablet 12x12. Since its old, I had to get a USB Adaptor for my ex-PC. That wasnt stable enough so I got a PCI card with two serial outputs on it. I plugged the wacom tablet in it, and that was working simply great.

I was wondering, could I use that PCI card on a powermac (g4/g5) or is it completely based on a different platform structure so I basically waste my time hoping it will work?

I know that AGP cards wont match due to the same reason, but maybe for the PCI slots its different?

Assuming I wont be able to use a PC card, do you guys think its enough to have a simple USB adaptor for this matter (like a cable convertor).

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